The discussion centers on recommendations for advanced books on Special Relativity (SR) for those seeking a deeper understanding beyond introductory texts. Participants suggest that many second treatments of SR often transition into General Relativity (GR), emphasizing geometric interpretations and tensor calculus. Notable recommendations include Sean Carroll's "Spacetime Geometry," Éric Gourgoulhon's "Special Relativity in General Frames," and Wolfgang Rindler's "Special Relativity." The conversation also touches on the challenges of finding suitable advanced texts, as few colleges offer extensive courses on SR, and some suggested books may be too specialized for general study. Overall, the thread highlights a desire for resources that provide a more sophisticated grasp of SR without immediately delving into GR.